📦src
 ┣ 📂config
 ┃ ┗ 📜index.ts
 ┣ 📂controller
 ┃ ┣ 📜auth.ts
 ┃ ┣ 📜book.ts
 ┃ ┣ 📜review.ts
 ┃ ┗ 📜user.ts
 ┣ 📂interface
 ┃ ┣ 📜IBook.ts
 ┃ ┣ 📜IReview.ts
 ┃ ┗ 📜IUser.ts
 ┣ 📂library
 ┃ ┣ 📜checkValidation.ts
 ┃ ┣ 📜constant.ts
 ┃ ┣ 📜convertSnakeToCamel.ts
 ┃ ┣ 📜response.ts
 ┃ ┗ 📜returnCode.ts
 ┣ 📂loader
 ┃ ┗ 📜db.ts
 ┣ 📂middleware
 ┃ ┣ 📜authMiddleware.ts
 ┃ ┗ 📜upload.ts
 ┣ 📂models
 ┃ ┣ 📜Book.ts
 ┃ ┣ 📜Review.ts
 ┃ ┗ 📜User.ts
 ┣ 📂others
 ┃ ┗ 📂slack
 ┃ ┃ ┣ 📜slack.ts
 ┃ ┃ ┗ 📜slackAPI.ts
 ┣ 📂router
 ┃ ┣ 📜auth.ts
 ┃ ┣ 📜book.ts
 ┃ ┣ 📜index.ts
 ┃ ┣ 📜review.ts
 ┃ ┗ 📜user.ts
 ┣ 📂service
 ┃ ┣ 📜auth.ts
 ┃ ┣ 📜book.ts
 ┃ ┣ 📜review.ts
 ┃ ┗ 📜user.ts
 ┣ 📂test
 ┃ ┣ 📂library
 ┃ ┃ ┗ 📜checkValidation.spec.ts
 ┃ ┗ 📂service
 ┃ ┃ ┣ 📜auth.spec.ts
 ┃ ┃ ┣ 📜book.spec.ts
 ┃ ┃ ┣ 📜review.spec.ts
 ┃ ┃ ┗ 📜user.spec.ts
 ┗ 📜index.ts